Form Factors and Long-Distance Effects in $Bto V(P) ell^+ell^-$ and $Bto V gamma$

I overview the hadronic input for the exclusive flavour-changing neutral-current $B$-decays with a vector ($V=K^*,rho$) or pseudoscalar ($P=K,pi$) meson in the final state. After presenting the current status of $Bto P,V$ form factors, I discuss the estimate of the charm-loop effect in $Bto K^{(*)} ell^+ell^-$ and $Bto K^* gamma$.